You really want to read this article, and not just because it is pro-Apple. There are two excellent marketing points in it, and an example of why the even biggest company needs to be flexible enough to get something out the door in 48 hours - over a weekend.
The Golden Age of Computer Sales surely must have been Christmas 1984. The Macintosh had just been released, Compaq and IBM offered powerful new CPUs, but the real action was a massive Christmas sales battle between the Apple//c and the IBM PCjr. I remember it well, I was working at ComputerLand in Los Angeles, and I was at the very center of the battle.